CS4141, Experiment #1 2 The University of Texas at Dallas
Contents
1. following Boolean relation Y A B C D Remember that we use a line over the expression to mean NOT Verify with your truth table that the circuit is working correctly 7 Equipment Disassembly The experimental procedure is complete Please disassemble the circuit wiring replace in the wiring kit box and replace it as you found it CS4141 Experiment 1 4 in the cabinet Turn in the logic circuit kit to the instructor or the TA Make sure that your work area is clean 8 Laboratory Report Your laboratory report should follow the form given In your write up discuss the operation of the circuits and the verification of the function of each Also do the following Show the circuit hook up for each of the circuits that you connected Make sure you remember to show the pin numbers of the gates that you connected e Prepare circuit diagrams for the two Boolean expressions in the last part of your exercise above Show these in your report e A NAND gate is a gate such that the output is 0 iff both inputs are 1 otherwise the output is 0 How would you construct a NAND function from the circuits given Show the diagram e Similarly a NOR gate is constructed such that the output is 0 if either or both inputs are 1 it is one only if both inputs are 0 Show a diagram for this circuit from the given components Acknowledgment Prof Herman Harrison CS4141 Experiment 1 52. The University of Texas at Dallas Department of Computer Science CS 4141 Digital Systems Lab Experiment 1 Familiarization with Lab Equipment and Simple AND OR and NOT Functions 1 Introduction This course is intended as a companion laboratory to CS4341 Digital Logic and Computer Design As such we will be becoming familiar with simple digital circuits in the first few laboratories since these relatively simple circuits make up all of the functional units in even the most sophisticated digital computer systems and microprocessor chips 2 Goal of this exercise The purpose of Experiment 1 is to 1 familiarize students with the laboratory equipment on which all of the digital hardware exercises will be performed and 2 to understand the operation of the three most fundamental logic gates the AND OR and NOT circuits 3 Theory of experiment The Boolean functions AND OR and NOT have been discussed in class The basic definitions are e A AND B is true or 1 or high if and only if iff both A and B are true or 1 or high That is the expression A B is 1 iff A and B are 1 A OR B is 1 if either A or B or both are 1 e NOT A is 1 only if A is 0 NOT A is 0 only if A is 1 For the digital logic circuits to be used today inputs are nominally 5 volts for a 1 and 0 volts technically less than about 0 7 volts for a 0 Likewise circuit outputs are nominally 0 volts for O or false and 5 volts for 1
3. forms sinusoidal triangular and square wave Both the frequency and amplitude can be varied On the right side of the panel there is a digital voltmeter that can measure various voltages applied to circuits Note that the voltmeter can be connected either to banana plugs or the small wire connectors that are used to connect circuit pins together 2 Study the flat portion of the IDL 800 chassis On the left side are two 5VDC non variable power outputs plus a variable DC supply with outputs of 0 15 and 0 15 V On the right are wire connector to banana plug adapters and other inputs which will not be used in this lab At the bottom are some function switches that can apply 5V and two pulse switches which will apply a 1 5V or 0 OV as long as they are held down There are also 8 data switches that can be switched to apply 1 or 0 5V or OV to any input At the rear of the flat board are data indicators including two seven segment displays which will display numbers and 8 light emitting diode LED indicators which can be connected to circuit pins to indicate whether a one 5V or a 0 OV is present A 1 will light up the LED a 0 turns it off 3 The center of the flat chassis area is the prototype board At the top and bottom are power busses When these are connected by the small solid copper wires to one of the supplies red to blue to ground or 0 all the other holes in the respective lines connect to that vo
4. ltage element 4 Note that the prototype board contains two main areas of pins When a chip is plugged into any set of pins in such a way that it bridges the wide space in the middle of each pin group all pin holes in each vertical column which contains a chip pin are also connected to that pin Thus other components inputs or voltages can be connected to each pin of the circuit being evaluated 5 Take some time to study the chassis and ask questions of the instructor or TA if necessary Experimental Procedure 6 NOT Function e Find the hex inverter 74LS04 and carefully plug it into the breadboard in either the upper or lower section Make sure that the long dimension of the chip package points left right with the notch on the left and that the chip legs bridge the wide space in the middle of the hole array The exact location of the chip from left to right on the board is arbitrary e Make sure the master power is off Using the small solid copper wires from the kit supplied connect 5V to pin 14 and OV ground to pin 7 Remember that the notch is located on the end of the chip where pin 1 is Looking down from the top pin 1 is on the left and pin 14 is on the right pin numbering is counter clockwise from to 14 refer to diagram on last page e There are six inverters NOT functions on the chip Any will do equally well but this example uses the first which has input on pin 1 and output on pin 2 Connect one of
5. ned the output is 1 iff both inputs are 1 Try this switching several times to get the feel of the circuit Turn off the power and disconnect the circuit connections 8 OR Function Find the 74LS32 chip and plug it into the board as you did the other circuits Connect pins 7 and 14 to ground and 5V respectively as before Note that there are 4 equal OR circuits on the chip but these instructions use the first one numerically refer to the pin out diagram as needed e Connect two data switches to the OR gate inputs pins 1 and 2 Make sure both inputs are 0 Connect the OR gate output pin 3 to an LED input e Turn on the power Verify that the LED is off Turn one data switch on to 1 The LED should light up Turn that data switch back to 0 and turn the other to 1 The LED should light up once again Now turn both switches on to 1 The LED should light under this condition also This verifies that the OR function is as defined the output is 1 if either or both inputs are 1 Try this switching several times as above to get the feel of the circuit e Turn off the power and disconnect the circuit connections 9 Solving for several expressions e Consider the following expression Y A B C D Use the quad AND gate chip to connect a circuit which will satisfy this expression you should have the truth table done as part of the pre work Verify that Y is 1 iff A D are 1 e Construct a circuit for the
6. or true In today s experiment we will verify that the electrical AND OR and NOT functions performed by the circuits in question do in fact correspond to AND OR and NOT logic relations 4 Experimental Equipment List The following experimental components are required for this experimental procedure e IDL 800 Digital Lab Circuits Evaluator breadboard unit with test equipment and power supply built in e IDL 800 User Manual e SN74LS08 quad 2 input AND gate digital logic kit e SN 74LS04 hex inverter NOT gate digital logic kit e SN 74LS32 quad 2 input OR gate digital logic kit e Breadboard wire connection kit e Pin assignment diagrams for 74LS04 74LS08 and 74LS32 5 Pre Work Prior to the laboratory period study class notes and prepare a truth table for each of the three logic function 2 input AND 2 input OR and NOT gates Bring CS4141 Experiment 1 2 these truth tables to the laboratory Also prepare truth tables for the two functions defined in part 9 of Section 6 below and bring them to the lab 6 Experimental Procedure Equipment Familiarization 1 Become familiar with the IDL 800 chassis refer to the manual at any time if additional clarification is needed Note that the rear panel forward facing near vertical panel at the back of unit contains the master power on off switch In addition the left side of the panel contains a function generator which can generate an electrical signal in three
7. the data switch outputs at the bottom of the panel bottom right to the input pin 1 of the inverter Connect the output of the inverter pin 2 to one of the LED diode inputs at the top of the horizontal portion of the IDL 800 Make sure that the data switch is in the 0 position CS4141 Experiment 1 3 e Turn on the power Verify that the LED is on since the input is 0 the output should be 1 OV so the diode should be illuminated e Turn the data switch to 1 Verify that the LED is extinguished The input is now 1 so the output is NOT 1 or 0 Toggle the switch several times to verify that the inverter or NOT gate output is always opposite of the input Turn off the power and disconnect the circuit connections 7 AND Function e Find the 74LS08 chip and plug it into the board as you did the 74LS04 Connect pins 7 and 14 to ground and 5V as before Note that there are 4 equal AND circuits on the chip but these instructions use the first one numerically refer to the pin out diagram as needed e Connect two data switches to the AND gate inputs pins 1 and 2 Make sure both inputs are 0 Connect the AND gate output pin 3 to an LED input e Turn on the power Verify that the LED is off Turn one data switch on to 1 The LED should stay off Turn that data switch back to 0 and turn the other to 1 The LED should still be off Now turn both switches on to 1 The LED should light This verifies that the AND function is as defi
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